Manchester United warmed up for their Europa League semi-final against Celta Vigo with a disappointing 2-0 loss at top four rivals Arsenal.

Here Samuel Luckhurst looks at five things we learned from the Emirates Stadium loss.

Tuanzebe proves his point

Alexis Sanchez is put under pressure from Axel Tuanzebe during the Premier League match between Arsenal and Manchester United at the Emirates Stadium on May 7, 2017 (Image: Richard Heathcote/Getty Images)

After he was ignored at Burnley and against Swansea Axel Tuanzebe was pitted against the world-class ability of Alexis Sanchez in a potentially corrosive acid test.

What’s more, Tuanzebe was started out of position at right-back. How admirable that he emerged as United’s most impressive defender from a back four which included Premier League champions and an Italy international.

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Tuanzebe’s calmness was patent at reserve level yet it was all the more impressive that he transmitted it to a testing fixture against Sanchez. He showed awareness and adventure in a full debut which was overdue and ended the game as United’s only outstanding outfield performer.

United supporters should not be surprised if he lines up in north London again on Sunday at Tottenham.

Mourinho’s transfer plans clearer

Jose Mourinho gives his team instructions during the Premier League match between Arsenal and Manchester United at the Emirates Stadium on May 7, 2017 (Image: Richard Heathcote/Getty Images)

United supporters should expect a significant transfer window after Michael Carrick and Wayne Rooney ended the game in central midfield. Looking at the United XI on the pitch at the conclusion of their unbeaten run, as many as six could be jettisoned in the summer and some took the fixture too frivolously.

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Mourinho was also testing certain seniors’ desire to stay at the club and none of the outfield players responded resoundingly.

It is near-impossible to justify keeping Chris Smalling when he regresses constantly. Phil Jones was frightened to play a forward pass, Matteo Darmian lacked balance, Carrick was nondescript and Rooney resembled a poorly pup wheezing towards the knackers’ yard.

United need a centre half, a full-back, two central midfielders, a forward and a striker.

Herrera’s hangover continues

Ander Herrera in action during the Premier League match between Arsenal and Manchester United at the Emirates Stadium on May 7, 2017

Ander Herrera received the United Player of the Month award for April when Eric Bailly was the best performer by a considerable distance as he started all nine matches.

Herrera was the beneficiary of the viral age. His magnificent performance against Chelsea sparked a multitude of memes online and he has dined off it for weeks, producing busy but underwhelming performances.

Darmian needs to stay on the leash

Mourinho explained in January he retained Matteo Darmian at left-back since he required three defenders while Antonio Valencia foraged forward to offer United another attacking outlet. At Arsenal, Darmian was granted that license and completely abandoned his defensive duties.

Time and again, Henrikh Mkhitaryan was reduced to an auxiliary wing-back with United’s Italian barely visible.

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That exacerbated Jones’ jitters on his first appearance in seven weeks and Arsenal repeatedly sought the marauding Alex Oxlade-Chamberlain down the right, giving the rookie Tuanzebe a calmer ride on the opposite flank.

Darmian is perhaps the only starter who will keep his place against Celta Vigo on Thursday and the leash will have to be reined in.

Rooney warming up for Carrick’s testimonial

Arsenal's Mesut Ozil runs away from Manchester United's Wayne Rooney as the Gunners run out 2-0 winners at the Emirates Stadium

The atmosphere was so apathetic at The Emirates the biggest cheer that emerged from the natives before Xhaka’s strike came from the concourse before the game had started. Fraser Forster’s penalty save at Anfield gave Arsenal and United added incentives to win despite the inevitability both will finish outside the top four safety net.

Arsene Wenger shouldn’t go on at Arsenal and neither should Rooney at United. It wasn’t just the harmless effort he attempted when one-on-one with Petr Cech but his startling lethargy on and off the ball.

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For someone who played the second fewest minutes of any United player last month, he appeared weary again and his presence in a game Mourinho had attempted to extract any significance from continued Rooney’s malaise.